Cam device



g- 4, 9 G. J. BOONZAIER 1,817,609

CAM DEVICE Filed Oct. 6, 1928 2 Sheets-Sheet 1 61- o7-12 Z511 Boon/ 4221" Aug- 4, 1931- G. J. BOONZAIER 1,317,609

CAM DEVICE Filed on. 6, 1.92s 2 Sheets-Sheet 2 Lye far; re orlz'a 51 2002128112? Iii fo ay Patented Aug. 4, 1931 TATES urrs GREGORIO JOHN BGONZAIER, HARLESDEN, ENGLAND I CAM DEVICE Application filed October 6, 1928, Serial No. 310,768, and in Great Britain October 13, 1927.

This invention involves an improved cam device which is primarily designed for use in connection with carbureters for internal combustion engines. The cam may be employed in a carburetor for the regulation of, for example, a jet-control needle, but it is also applicable to other purposes. For example, it may be used as a master cam for facilitating the commercial manufacture of cams for 1 any purpose.

Other objects and features of the invention will appear from the following description, referring to the accompanying drawings, in which l- Fig. 1 is an elevation of a cam according to the invention;

Fig. 2 is a detail of the cam mechanism;

Fig. 3 is a part-sectional elevation of one form of carburetor equipped with the in- 2o vention, and

Fig. 4 is a plan thereof.

Referring more particularly to the drawings, the carburetor body, in the construction illustrated, consists of an intake pipe A, Fig.

as 3, flanged at its upper end for attachment to the intake manifold of the engine, and having in its lower end, which is the only air intake of the carburetor, a jet or fuel nozzle A which is supplied from an annular float so chamber B arranged around the intake pipe and rigidly connected with it and provided with a petrol pipe B, Fig. 4, said chamber containing an annular float B Around the jet A and at or near its upper 35 end is inserted a variable iris diaphragm choke D, of which the various apertures, from a pin hole to wide open, are always circular, with the jet centrally located there in. This diaphragm is operated by a partial 4o rotation of its mount by means of a spider D and a metal tube which extends upwards and through the cover E of the intake pipe. The diaphragm aperture around the jet is controllable externally by means of a lever 4 N which engages the tube 0. This diaphragm operating lever is slidably attached to the main throttle lever L by a slide rod M Means are provided for temporarily decreasing the diaphragmaperture by withdrawing the slide rod M by means of an auxiliary pinion is threaded on to the needle valve F.

The cam K consists of a pivoted body, which pivot engages in the split bush end of the throttle spindle L and is held in the desired tilted position by a bolt or set screw L The helix of the cam K is variable and is constituted by a flexible metal blade of steel or other suitable material K Fig. 1. This cam helix-blade operates the quadrant H, Fig. 4, which in turn engages the threaded pinion G. At the cam end the quadrant H is provided with a slotted swivelling washer H Fig. 2.

The slotted washer is retained in position in the circularly recessed end of the quadrant by a cap plate H and pivot set screw H The blade of the cam is variable between its extreme position K Fig. 1, by means of set screws K six in number. The fuel supply can therefore be regular-or irregular relative to thethrottle movement and choke diaphragm apertures. The needle valve F is prevented from rotating by a square or suitably shaped end sliding through a guide P so that any rotation imparted to the pinion G reciprocates the needle valve F, the pinion Gr being prevented from rising by a spacing washer between it and the guide P, or by other suitable means. Clearly the cam might act directly on the valve or through other suitable mechanism.

While the cam above described has been shown as applied to a carburetor, it will be clear that its use is not confined to this particular purpose.

What I claim is 1. A cam device comprising a U-shaped base, a flexible strip carried between the arms of the U, and means mounted in the arms of said U-shaped base for adjusting the contour of said strip.

2. A cam device comprising a U-shaped base, pairs of adjustable screws carried by the arms of the U, and a flexible strip supported between said screws.

3. A cam device comprising a U-shaped base, a flexible member carried between the arms of said U-shaped base with its Walls in parallelism therewith, and adjustable screws carried by said arms for engagement with the walls of said strip for varying the contour thereof.

4. A cam device comprising a U-sh-aped 5 base, a flexible member carried between the arms of said U-shaped base with its walls in parallelism therewith, and adjustable screws carried by said arms for engagement with the walls of said strip for varying the contour thereof, said strip projecting beyond said arms for engagement by a follower.

GREGORIO JOHN BOONZAIER. 

